feat(issue-652): wire effort and task_budget to claude sdk output_config

Adds _load_config_dict() helper to ClaudeSDKExecutor and wires the new
effort and task_budget config fields into _build_options() before the
Anthropic API call:

- effort (str): low|medium|high|xhigh|max — populates output_config.effort
- task_budget (int): advisory total-token budget; must be >= 20000 when set;
  automatically adds task-budgets-2026-03-13 beta header

Also adds WorkspaceConfig.effort and WorkspaceConfig.task_budget fields in
config.py and 5 acceptance tests covering all code paths.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

workspace-template/claude_sdk_executor.py

@@ -33,6 +33,8 @@ from collections.abc import AsyncIterator
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any
 
+import yaml
+
 import claude_agent_sdk as sdk
 
 from a2a.server.agent_execution import AgentExecutor, RequestContext
@@ -233,6 +235,19 @@ class ClaudeSDKExecutor(AgentExecutor):
             return prompt
         return f"[Prior context from memory]\n{memories}\n\n{prompt}"
 
+    def _load_config_dict(self) -> dict:
+        """Read config.yaml as a raw dict for field-level inspection.
+
+        Returns an empty dict on any I/O or parse error so callers can
+        always use ``.get()`` without guards.
+        """
+        try:
+            config_file = os.path.join(self.config_path, "config.yaml")
+            with open(config_file) as f:
+                return yaml.safe_load(f) or {}
+        except Exception:
+            return {}
+
     def _build_options(self) -> Any:
         """Build ClaudeAgentOptions.
 
@@ -243,6 +258,18 @@ class ClaudeSDKExecutor(AgentExecutor):
 
         The MCP server launcher uses `sys.executable` so tests and alternate
         virtual-env layouts don't depend on a `python3` shim being on PATH.
+
+        output_config wiring (issue #652)
+        ----------------------------------
+        Reads ``effort`` and ``task_budget`` from config.yaml and populates
+        ``output_config`` on the SDK options before the API call:
+
+        - ``effort`` (str): one of low|medium|high|xhigh|max.  xhigh is the
+          Opus 4.7 recommended default for long agentic tasks.
+        - ``task_budget`` (int): advisory total-token budget across the full
+          agentic loop.  Must be >= 20000 (API minimum) or 0/absent (unset).
+          When set, the ``task-budgets-2026-03-13`` beta header is added so
+          the API accepts the field.
         """
         mcp_servers = {
             "a2a": {
@@ -250,7 +277,8 @@ class ClaudeSDKExecutor(AgentExecutor):
                 "args": [get_mcp_server_path()],
             }
         }
-        return sdk.ClaudeAgentOptions(
+
+        create_kwargs: dict = dict(
             model=self.model,
             permission_mode="bypassPermissions",
             cwd=self._resolve_cwd(),
@@ -259,6 +287,35 @@ class ClaudeSDKExecutor(AgentExecutor):
             resume=self._session_id,
         )
 
+        # --- output_config: effort + task_budget (issue #652) ---
+        config = self._load_config_dict()
+        output_config: dict = {}
+        effort = config.get("effort", "")
+        task_budget = config.get("task_budget", 0)
+
+        if effort:
+            output_config["effort"] = effort  # "low"|"medium"|"high"|"xhigh"|"max"
+
+        if task_budget and int(task_budget) >= 20000:
+            output_config["task_budget"] = {
+                "type": "tokens",
+                "total": int(task_budget),
+            }
+            betas = list(create_kwargs.get("betas", []))
+            if "task-budgets-2026-03-13" not in betas:
+                betas.append("task-budgets-2026-03-13")
+            create_kwargs["betas"] = betas
+        elif task_budget and int(task_budget) > 0:
+            # Below minimum — reject clearly before any API call is made.
+            raise ValueError(
+                f"task_budget must be >= 20000 tokens (got {task_budget})"
+            )
+
+        if output_config:
+            create_kwargs["output_config"] = output_config
+
+        return sdk.ClaudeAgentOptions(**create_kwargs)
+
     # ------------------------------------------------------------------
     # Query streaming
     # ------------------------------------------------------------------

workspace-template/config.py

@@ -228,6 +228,14 @@ class WorkspaceConfig:
     security_scan: SecurityScanConfig = field(default_factory=SecurityScanConfig)
     compliance: ComplianceConfig = field(default_factory=ComplianceConfig)
     sub_workspaces: list[dict] = field(default_factory=list)
+    effort: str = ""
+    """Claude output effort level for the agentic loop: low | medium | high | xhigh | max.
+    Empty string = not set (model default applies).  xhigh is the Opus 4.7 recommended
+    default for long agentic tasks.  Passed as ``output_config.effort`` by ClaudeSDKExecutor."""
+    task_budget: int = 0
+    """Advisory total-token budget across the full agentic loop.  0 = not set.
+    Must be >= 20000 when non-zero (API minimum).  When set, ClaudeSDKExecutor
+    automatically adds the ``task-budgets-2026-03-13`` beta header."""
 
 
 def load_config(config_path: Optional[str] = None) -> WorkspaceConfig:
@@ -346,4 +354,6 @@ def load_config(config_path: Optional[str] = None) -> WorkspaceConfig:
             max_task_duration_seconds=int(compliance_raw.get("max_task_duration_seconds", 300)),
         ),
         sub_workspaces=raw.get("sub_workspaces", []),
+        effort=str(raw.get("effort", "")),
+        task_budget=int(raw.get("task_budget", 0)),
     )

workspace-template/tests/test_claude_sdk_executor.py

@@ -1071,3 +1071,85 @@ def test_execute_clears_session_between_retries_on_process_error(caplog):
     # INFO log confirms the reset fired
     info_messages = " | ".join(r.message for r in caplog.records if r.levelname == "INFO")
     assert "SDK session reset after FakeProcessError" in info_messages
+
+
+# ---------------------------------------------------------------------------
+# _build_options — issue #652: effort + task_budget output_config wiring
+# ---------------------------------------------------------------------------
+
+
+def _build_options_with_config(config: dict):
+    """Helper: build ClaudeAgentOptions with the given config.yaml values.
+
+    Stubs out all I/O helpers so only the output_config wiring logic is tested.
+    """
+    e = ClaudeSDKExecutor(system_prompt=None, config_path="/tmp", heartbeat=None)
+    with patch.object(e, "_load_config_dict", return_value=config), \
+         patch.object(e, "_resolve_cwd", return_value="/workspace"), \
+         patch.object(e, "_build_system_prompt", return_value=None), \
+         patch("claude_sdk_executor.get_mcp_server_path", return_value="/mcp.py"):
+        return e._build_options()
+
+
+def test_build_options_effort_only_sets_output_config_no_beta():
+    """effort='xhigh', no task_budget → output_config={'effort':'xhigh'}, no betas.
+
+    Acceptance criterion: effort field wired into output_config without adding
+    the task-budgets beta header (beta is only required for task_budget).
+    """
+    opts = _build_options_with_config({"effort": "xhigh"})
+    assert opts.kwargs.get("output_config") == {"effort": "xhigh"}
+    assert "betas" not in opts.kwargs
+
+
+def test_build_options_task_budget_sets_output_config_and_beta():
+    """task_budget=128000 → output_config with token budget struct + beta header.
+
+    Acceptance criterion: task_budget >= 20000 writes the nested
+    {'type':'tokens','total':N} struct and adds 'task-budgets-2026-03-13' to betas.
+    """
+    opts = _build_options_with_config({"task_budget": 128000})
+    assert opts.kwargs.get("output_config") == {
+        "task_budget": {"type": "tokens", "total": 128000}
+    }
+    assert "task-budgets-2026-03-13" in opts.kwargs.get("betas", [])
+
+
+def test_build_options_both_effort_and_task_budget():
+    """Both effort and task_budget → combined output_config + beta header.
+
+    Acceptance criterion: both keys present in the single output_config dict;
+    betas includes the task-budget feature flag.
+    """
+    opts = _build_options_with_config({"effort": "high", "task_budget": 50000})
+    assert opts.kwargs.get("output_config") == {
+        "effort": "high",
+        "task_budget": {"type": "tokens", "total": 50000},
+    }
+    assert "task-budgets-2026-03-13" in opts.kwargs.get("betas", [])
+
+
+def test_build_options_neither_effort_nor_task_budget_no_output_config():
+    """Empty config (effort='', task_budget=0) → output_config absent, no betas.
+
+    Acceptance criterion: when neither field is configured the SDK options
+    are unchanged — no spurious output_config or betas keys.
+    """
+    opts = _build_options_with_config({})
+    assert "output_config" not in opts.kwargs
+    assert "betas" not in opts.kwargs
+
+
+def test_build_options_task_budget_below_minimum_raises_value_error():
+    """task_budget=5000 (below 20000 API minimum) → ValueError before any API call.
+
+    Acceptance criterion: the executor must refuse to build options when
+    task_budget is set but too small, so no invalid request reaches the API.
+    """
+    e = ClaudeSDKExecutor(system_prompt=None, config_path="/tmp", heartbeat=None)
+    with patch.object(e, "_load_config_dict", return_value={"task_budget": 5000}), \
+         patch.object(e, "_resolve_cwd", return_value="/workspace"), \
+         patch.object(e, "_build_system_prompt", return_value=None), \
+         patch("claude_sdk_executor.get_mcp_server_path", return_value="/mcp.py"):
+        with pytest.raises(ValueError, match="task_budget must be >= 20000"):
+            e._build_options()